From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 54749C433E0 for ; Wed, 10 Mar 2021 08:17:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 12B1D64FDE for ; Wed, 10 Mar 2021 08:17:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231926AbhCJIRL (ORCPT ); Wed, 10 Mar 2021 03:17:11 -0500 Received: from smtp01.belwue.de ([129.143.71.86]:35611 "EHLO smtp01.belwue.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231378AbhCJIRF (ORCPT ); Wed, 10 Mar 2021 03:17:05 -0500 Received: from fex.rus.uni-stuttgart.de (fex.rus.uni-stuttgart.de [129.69.1.129]) by smtp01.belwue.de (Postfix) with SMTP id 1AA2E6B19 for ; Wed, 10 Mar 2021 09:17:04 +0100 (MET) Date: Wed, 10 Mar 2021 09:17:03 +0100 From: Ulli Horlacher To: linux-btrfs@vger.kernel.org Subject: Re: nfs subvolume access? Message-ID: <20210310081703.GC2158@tik.uni-stuttgart.de> Mail-Followup-To: linux-btrfs@vger.kernel.org References: <20210310074620.GA2158@tik.uni-stuttgart.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210310074620.GA2158@tik.uni-stuttgart.de> User-Agent: Mutt/1.5.23 (2014-03-12) Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On Wed 2021-03-10 (08:46), Ulli Horlacher wrote: > When I try to access a btrfs filesystem via nfs, I get the error: > > root@tsmsrvi:~# mount tsmsrvj:/data/fex /nfs/tsmsrvj/fex > root@tsmsrvi:~# time find /nfs/tsmsrvj/fex | wc -l > find: File system loop detected; '/nfs/tsmsrvj/fex/spool' is part of the same file system loop as '/nfs/tsmsrvj/fex'. > 1 > tsmsrvi and tsmsrvj (nfs client and server) both run Ubuntu 20.04 with > btrfs-progs v5.4.1 On Ubuntu 18.04 this setup works without errors: root@mutter:/backup/rsync# grep tandem /etc/exports /backup/rsync/tandem 176.9.135.138(rw,async,no_subtree_check,no_root_squash) root@mutter:/backup/rsync# btrfs subvolume list /backup/rsync | grep tandem ID 257 gen 62652 top level 5 path tandem ID 5898 gen 62284 top level 257 path tandem/.snapshot/2021-03-01_0300.rsync ID 5906 gen 62284 top level 257 path tandem/.snapshot/2021-03-02_0300.rsync ID 5914 gen 62284 top level 257 path tandem/.snapshot/2021-03-03_0300.rsync ID 5924 gen 62284 top level 257 path tandem/.snapshot/2021-03-04_0300.rsync ID 5932 gen 62284 top level 257 path tandem/.snapshot/2021-03-05_0300.rsync ID 5941 gen 62284 top level 257 path tandem/.snapshot/2021-03-06_0300.rsync ID 5950 gen 62284 top level 257 path tandem/.snapshot/2021-03-07_0300.rsync ID 5962 gen 62413 top level 257 path tandem/.snapshot/2021-03-08_0300.rsync ID 5970 gen 62522 top level 257 path tandem/.snapshot/2021-03-09_0300.rsync ID 5978 gen 62626 top level 257 path tandem/.snapshot/2021-03-10_0300.rsync root@mutter:/backup/rsync# btrfs version btrfs-progs v4.15.1 root@tandem:/backup# mount | grep backup mutter:/backup/rsync/tandem on /backup type nfs (ro,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,soft,proto=tcp,timeo=600,retrans=1,sec=sys,mountaddr=176.9.68.251,mountvers=3,mountport=52943,mountproto=tcp,local_lock=none,addr=176.9.68.251) root@tandem:/backup# ls -l .snapshot/ total 0 drwxr-xr-x 1 root root 392 Mar 1 03:00 2021-03-01_0300.rsync drwxr-xr-x 1 root root 392 Mar 2 03:00 2021-03-02_0300.rsync drwxr-xr-x 1 root root 392 Mar 3 03:00 2021-03-03_0300.rsync drwxr-xr-x 1 root root 392 Mar 4 03:00 2021-03-04_0300.rsync drwxr-xr-x 1 root root 392 Mar 5 03:00 2021-03-05_0300.rsync drwxr-xr-x 1 root root 392 Mar 6 03:00 2021-03-06_0300.rsync drwxr-xr-x 1 root root 392 Mar 7 03:00 2021-03-07_0300.rsync drwxr-xr-x 1 root root 392 Mar 8 03:00 2021-03-08_0300.rsync drwxr-xr-x 1 root root 392 Mar 9 03:00 2021-03-09_0300.rsync drwxr-xr-x 1 root root 392 Mar 10 03:00 2021-03-10_0300.rsync So, it is an issue with the newer btrfs version on Ubuntu 20.04? -- Ullrich Horlacher Server und Virtualisierung Rechenzentrum TIK Universitaet Stuttgart E-Mail: horlacher@tik.uni-stuttgart.de Allmandring 30a Tel: ++49-711-68565868 70569 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/ REF:<20210310074620.GA2158@tik.uni-stuttgart.de>